Method of making cutting dies



M. E. FERNALD.

METHOD OF MAKING CUTTING DIES.

APPLICATION FILED OCT. 1. I915.

Patented. Jan. M, 1922..

# iglll lllL lll llll llu UNHTET) STATES PATENT (@JFFHQET.

IEARK E. FER/MALI OF SA'UGUS, EEASSACHUSETTS, A SSIGNOR TO C. C. BLAKE,INCORPORATED, OF BOSTGN, IHEASSACHUSETTS, A. CGRPORATION OF NEW roan.

Application filed October 1, 1915.

To all whom it may concern:

Be it known that 1, MARK F. FERNALD, a citizen of the United States,residing at Saugus, in the county of Essex and State of Massachusetts,have invented a new and useful Improvement in Methods of Making CuttingDies, of which the following is a specification.

The present invention relates to methods for making cutting dies whichare used to dink out irregular shapes from sheet ma terial.

Heretofore these cutting dies have been hand-forged which is anexpensive and laborious operation requiring the services of a skilledoperative.

The object of the present invention is to provide a simple, cheap andeffective method by means of which cutting dies may be manufacturedwithout the employment of skilled labor.

To the accomplishment of this object, and the production of a novelcutting die, the features of the invention relate to certain methods,devices, combinations and arrangements of parts hereinafter describedand then set forth broadly and in detail in the appended claim whichpossess advantages readily apparent to those skilled in the art.

The various features of the present invention will be readily understoodfrom an inspection of the accompanying drawings showing the best methodof practising the invention at present known to the inventor, in which,

Figure 1 is a plan of the blank for the casting pattern, for casting thecutting die, provided with a flange which is built upon the blank bywinding a strip of paper in layers on the edge thereof;

Fig. 2 is a sectional elevation of the blank shown in Figure 1;

Fig. 3 is an elevation, partly in section, of a machine for imparting adraft to the flange of the casting pattern;

Fig. 1 is a sectional elevation of the finished casting pattern;

Fig. 5 is a plan of the cutting die; and

Fig. 6 is a sectional elevation of the cut ting die.

Describing now in general terms my novel method of making cutting diesthe first step consists in the production of a flat blank for thefoundation of a casting pattern for Specification of Letters Patent.

Patented Jan. 19, 1922..

Serial no. 53,640.

casting the cutting die. This blank is substantially the same size andshape as the sole to be cut out of the hide by the finished cutting die.The sole-shaped blank 1 is then inserted into the machine described inapplication for Letters Patent of the United States filed by me'October27, 1914, Serial No. 868,921. This machine is provided with a rotatablesupport for the blank; devices for supporting, guiding and feeding astrip of material, such as paper; and a pair of rolls for attaching thepaper to the peripheral edge of the blank and winding the paper inlayers thereon. To build the guiding flange the rolls are mounted upon acarrier which tips automatically as the point of operation of the rollsis transferred around the reverse curves of the blank to maintain therolls substantially normal to the point of operation. This carrier ismounted on a swinging support which swings automatically during therotation of the blank to permit the rolls to travel around the toe andheel portions of the blank and reach the shank portions thereof. Themachine is also provided with a feed accelerator which imparts anautomatic pull to the supply end of the paper so that the paper may beattached to the shank portions of the blank while the paper is free fromtension. After the pattern is completed by this machine the draftnecessary for the removal of the pattern from the sand is imparted tothe pat tern by a second machine which is disclosed in application forLetters Patent of the United States filed by Charles C. Blake, October29, 1914, Serial No. 869,336, to which reference is made by permission.This machine is provided with a series of rolls which simultaneouslysupport, guide, feed and operate automatically upon the pattern toimpart the draft thereto and remove any roughness on the top and bottomfaces of the flange. After the pattern has been removed from thismachine the surplus stock upon the exterior face of the flange at thelower end thereof is removed and a fillet of beeswax is placed in theangles at the junctures of the flange and the body portion of the blankin order to prevent the molders sand from lodging in the cracks at thesepoints. The pattern is then finished by providing it with a coat ofshellac. The casting pattern thus produced is utilized in the castingfor I the cutting die. After being removed from the sand the flange onthe casting is ground on its exterior face at. the lower end thereof toformtlie cutting edge of the die.

Referring to the drawings the sole-shaped blank 1 is provided with alaminated flange 2 which has been built upon the blank by winding astrip of paper in layers around the peripheral edge thereof. In order toimpart the draft to the fiangene'cessary' for the removalof the castingpattern from the molder sand" and to smooth the irregularities on thetop and bottom faces'of the flange the pattern is passed through amachine provided with a 'series of rolls which "support, guide, feed andoperate automatically upon the pattern asit passes through the machine.

As shown in Figure 3 these rolls comprise a pair of rolls 3 and} whichengage the top 20- and botom faces of the body portion o'fthe patternrespectively and which are also constructed and arranged to engage theinner faces of the flange and impart the draft thereto, a pair 015561195 and 6 which enigage the top and bottom faces of the flangerespectively and smooth the irregularities thereon, and a fifth roll 7which engages the outer face of the flange and imparts the draftthereto.

After the draft has been imparted to the pattern thepattern'is firstdried and then the surplusinaterial upon the exterior face of the flangeat the lower end thereof is removed a shown at 8 (Fig at). A fillet ofbeeswax 9 is then placed in the angles at the jun c tures of the flange'2 and body portion 1 (Fig. 4) in order to prevent the molderssand fromlodging in the cracks at these points. The pattern isthen finished byproviding it with a coat of shellac. 1 The finished casting pattern isthen utilized in the'casting of the cuttingdie which comprises a bodyportion 10 having a peripheral flange'll. Upon its removal from the sandthe flange 11 of the cutting die is ground upon. its exterior face atthe-lower end thereof to form the cutting edge 12.

VVhilethe 'illustrated embodiment of the present invention is directedto the manufacture of a cuttingdie'for use in cutting soles from hidesor other sheet material, it will be apparent to those skilled in the artthat the methods herein disclosed may be advantageously employed inmaking other kinds of cutting dies.

modified without departing" from the spirit of the invention.

lVhat 1s claimed as new, is

' i That improvement in the art of making cutting dies which consists inproducing a blank, building a'flange upon the edge of the blank,imparting, a draft to the flange,

' "removing surplus stock from the exterior face of the flange at thelower end thereof, and utilizing the product of the four steps recited aa casting pattern for casting the cutting die.

' MARK E. FERNALD.

